To qualify for ADP, you must meet the qualifying periods conditions. There are two: the ‘backwards condition’ and the ‘forwards condition’. These conditions will not apply if you are terminally ill (see 22 below ).
DAWAP(S) Regs, reg 26(2)

You must pass the disability test(s) (see 11 above ) throughout the 13 weeks before the claim. The claim can be made during this 13-week period, but payment will not start until the qualifying period has been served.
DAWAP(S) Regs , regs 10(3), 11, 12 & 13

If you re-claim ADP within two years of the end of a previous award of ADP, child disability payment (CDP), disability living allowance* (DLA) or personal independence payment (PIP) for substantially the same physical or mental condition(s) (or a new condition that developed as a result of the one for which the previous award was made), the claims are linked. This means if you have a relapse, you do not have to re-serve the 13-week qualifying period. Yo